[efi]

I have a philips hd tv, it uses a dvi-i port for the hd signal and next to the dvi is what looks like a 3.5mm? port that says dvi audio in

I can connect my skyhd box to the dvi port with a hdmi>dvi convertor and get the picture but not sure what sort of cable i need for the sound.. as the hd box appears to be optical?

The cable I was sold is a digital optical cable with the square like connection and an add on to make it a 3.5mm? jack but it doesn't give sound..

What do I need to get so I can get the sound to go with my hd picture?

Cheers